stat.c

/* Work around platform bugs in stat. Copyright (C) 2009, 2010 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. *//* written by Eric Blake */#include <config.h>/* Get the original definition of stat. It might be defined as a macro. */#define __need_system_sys_stat_h#include <sys/types.h>#include <sys/stat.h>#undef __need_system_sys_stat_hstaticinlineint
orig_stat (constchar *filename, struct stat *buf)
{
return stat (filename, buf);
}
/* Specification. */#include <sys/stat.h>#include <errno.h>#include <limits.h>#include <stdbool.h>#include <string.h>/* Store information about NAME into ST. Work around bugs with trailing slashes. Mingw has other bugs (such as st_ino always being 0 on success) which this wrapper does not work around. But at least this implementation provides the ability to emulate fchdir correctly. */int
rpl_stat (charconst *name, struct stat *st)
{
int result = orig_stat (name, st);
#if REPLACE_FUNC_STAT_FILE/* Solaris 9 mistakenly succeeds when given a non-directory with a trailing slash. */if (result == 0 && !S_ISDIR (st->st_mode))
{
size_t len = strlen (name);
if (ISSLASH (name[len - 1]))
{
errno = ENOTDIR;
return -1;
}
}
#endif /* REPLACE_FUNC_STAT_FILE */#if REPLACE_FUNC_STAT_DIRif (result == -1 && errno == ENOENT)
{
/* Due to mingw's oddities, there are some directories (like c:\) where stat() only succeeds with a trailing slash, and other directories (like c:\windows) where stat() only succeeds without a trailing slash. But we want the two to be synonymous, since chdir() manages either style. Likewise, Mingw also reports ENOENT for names longer than PATH_MAX, when we want ENAMETOOLONG, and for stat("file/"), when we want ENOTDIR. Fortunately, mingw PATH_MAX is small enough for stack allocation. */char fixed_name[PATH_MAX + 1] = {0};
size_t len = strlen (name);
bool check_dir = false;
if (PATH_MAX <= len)
errno = ENAMETOOLONG;
elseif (len)
{
strcpy (fixed_name, name);
if (ISSLASH (fixed_name[len - 1]))
{
check_dir = true;
while (len && ISSLASH (fixed_name[len - 1]))
fixed_name[--len] = '\0';
if (!len)
fixed_name[0] = '/';
}
else
fixed_name[len++] = '/';
result = orig_stat (fixed_name, st);
if (result == 0 && check_dir && !S_ISDIR (st->st_mode))
{
result = -1;
errno = ENOTDIR;
}
}
}
#endif /* REPLACE_FUNC_STAT_DIR */return result;
}